<?php
namespace encrypt;
/**
 * 哈希加密解密
 * 16位变长(非汉字)
 */
class HashCrypt
{
    private $iv;
    private $key;

    function __construct()
    {
        $this->key=config('encrypt.hash_key');
        $this->iv=config('encrypt.hash_iv');
    }

    function encrypt($str) {
        $str=trim($str);
        //$key = $this->hex2bin($key);
        $iv = $this->iv;

        $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);

        mcrypt_generic_init($td, $this->key, $iv);
        $encrypted = mcrypt_generic($td, $str);

        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);

        return bin2hex($encrypted);
    }

    function decrypt($code) {
        //$key = $this->hex2bin($key);
        $code=trim($code);
        $code = $this->hex2bin($code);
        $iv = $this->iv;

        $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);

        mcrypt_generic_init($td, $this->key, $iv);
        $decrypted = mdecrypt_generic($td, $code);

        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);

        return utf8_encode(trim($decrypted));
    }

    protected function hex2bin($hexdata) {
        $bindata = '';

        for ($i = 0; $i < strlen($hexdata); $i += 2) {
            $bindata .= chr(hexdec(substr($hexdata, $i, 2)));
        }

        return $bindata;
    }
}
